booster dose

British

noun

a supplementary injection of a vaccine given to maintain the immunization provided by an earlier dose

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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booster dose

This was six months after participants received the third yearly booster dose of the vaccine candidate under development, called VLA15.

From The Wall Street Journal ● Nov. 26, 2025

Early reports flagged a type of heart swelling called myocarditis as a rare side effect of the mRNA vaccine, particularly for young men ages 18 to 25 after a booster dose.

From Salon ● Sep. 5, 2025

And California officials require a booster dose for students entering seventh grade.

From Los Angeles Times ● Jun. 5, 2024

While the FDA did allow seniors and others at high risk to get an extra booster dose last spring, most Americans haven’t had a vaccination in about a year.

From Seattle Times ● Sep. 8, 2023

Last autumn frontline health and care workers, adults aged 50 and over and some carers and household contacts were also offered a booster dose.

From BBC ● Apr. 1, 2023

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023